2. Because they like fire. Prove me wrong.

3.Just because you haven't seen it doesn't mean it doesn't happen. They've had a lot of time to figure it out (they don't even have jobs)

4. They're clever animals. How can you say they wouldn't?

...to be more serious about it, I was using an extreme example to make a point. It is next to impossible to prove that someone has never done something, so when you start arguing on a basis like that you just descend into an abyss of unanswerable mess.